Improvement in trip-hammers



timidi iai BENJAMIN IIERSIIEY or ERIE, PENNSYLVANIA.

Letters PatentNo. 112,036, dated February 21, 1871.

IMPROVEMENT IN TRIP-HAMMERS.

The schedina referred zo in man mmf. lPeteur; and making pm of um same..

I, BENJAIIIINI HERSHEY, of Erie, in the county ot' Erie and Stat-e of Pennsylvania, have invented certain Improvements vin Power-Hammers, of which the followingis a specification.

The nature of myiuvent'ion consists in so securing in a suitable frame, a poWerdrop-hannner, a torsional spring, and a. horizontall shaft, having an S-shaped cam attached, that the cam `shall elevate the hammer, and the spring shall, Vthrough its torsional action, throw it with its full force and power on the anvil, substantially :1s-hereinafter described.

Figure 1, a perspective view of the machine.

Figure 2, a view of the hammer.

A, bed-plate of the machine.

B, the anvil. Y

C, die of the hammer D.

e f, frame and slides for the hammer.v

g, pin by which the ca m lifts the hammer.

H, double cani. This isS-slia-ped. 1t is 'so constructed and placed as to take the hammer on the rebound from the anvil.

'i j L, torsion spring.

lm, standard to hold the spring and shaft q.

. n, belt-pulley for drivinir the shaft.

o, crank to drive the shaft by hand.

,11, upper end of the hammer covered with a steel plate for the ends i fi of the spring to slide on. A

g, driving-shafby which the cam H is operated.

s t, ends of thecam.

c, tongues to hold the hammer in its slides.

The operation is as follows:

The. hammer is represented5 in fir'. 1 at rest on the anvil. The shaft q is revolved by the crank o or bythe pulley n, the crank moving` toward 'n The cam lifts the hammer by the pin g until the end p presses the ends of the springsti, and compresses it sufficiently for the end ot' the cam s to pass the pin. The-hammer is then started by the quick energy of the spring, and strikes the anvil B an eifective blow. The arm t comes to the pin on the rebound, and produces a secondblow for the revolution of the crank.

The S-shape ofthe cam gives the best lifting power. when it first strikes the pin g. The arm `slof the cam rises above the horizontal line before the hammer lstrikes the spring. The distance traveled by s then increases for a given distance of rise in the hammer. By this fact, as well as the shape ofthe cam, the force to compress the spring and raise the hammer increases with the resistance of the spring'. 

